Require skull texture lookup on paper servers

[sovdeeth]

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Description

Paper does not seem to fetch textures synchronously for skull metas like spigot does, meaning playerprofiles without texture data will resolve to untextured skulls. This forces a synchronous lookup as a non-breaking change when applying skull owners.

It may be better to move this lookup to the original offlineplayer acquisition, opinions welcome.

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Target Minecraft Versions: any Requirements: none Related Issues: #7068